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- Title
Search for new hadronic decays of h<sub>c</sub> and observation of h<sub>c</sub> → pp¯η.
- Authors
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.
- Abstract
A search for the hadronic decays of the hc meson to the final states p p ¯ π+π−π0, p p ¯ η , and p p ¯ π0 via the process ψ(3686) → π0hc is performed using (4.48 ± 0.03) × 108ψ(3686) events collected with the BESIII detector. The decay channel hc → p p ¯ η is observed for the first time with a significance greater than 5σ and a branching fraction of (6.41 ± 1.74 ± 0.53 ± 1.00) × 10−4, where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686) → π0hc. Strong evidence for the decay hc → p p ¯ π+π−π0 is found with a significance of 4.9σ and a branching fraction of (3.84 ± 0.83 ± 0.69 ± 0.58) × 10−3. The significances include systematic uncertainties. No clear signal of the decay hc → p p ¯ π0 is found, and an upper limit of 6.59 × 10−4 on its branching fraction is set at the 90% confidence level.
- Subjects
MESON decay; HADRONIC atoms; DETECTORS; CONFIDENCE
- Publication
Journal of High Energy Physics, 2022, Vol 2022, Issue 5, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP05(2022)108